Stitch-forming mechanism for sewing-machines.



w. L. BARRON & F. E. OSOL.

STITCH FORMING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED AUG.25. I915- 1,290,018, Patented Jan. 7, 1919.

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TED STATES PATENT OFFICE.

WILLIAM L. BARRON, OF NEW YORK, N. Y., A'ND FRITZ E. OSOL, OF ELIZABETH, NEW JERSEY, ASSIGNORS TO THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW. JERSEY.

STITCH-FORMING MECHANISM FOR SEWING-MACHINES.

Application filed August 25, 1915.

To all whom it may concern:

Be it known that we, WILLIAM L. BAR- RON and Farm E. OsoL, citizens of the United States, residing at New York, in the accompanying drawings.

This invention relates to improvements in stitch-forming mechanism for sewing machines, and has for its object to provide loop-controlling means especially adapted for use in connection with single chainstitch machines.

In the present embodiment of the invention the loop-controlling elements are carried by the throat-plate at its underside and comprise means for deflecting both limbs of the needle-loop just prior to the beginning of the loop-shedding retraction of the looptaker and for holding the thus deflected needle-loop in position for penetration by the needle regardless of the direction in which the material is fed; the improvements also comprising means for pushing the penetrated needle-loop up the blade of the needle toward the throat-plate, and for holding the loop in such position and thus out of the way of the looper as the latter advances to seize a succeeding loop.

The loop deflector is conveniently made up in the form of a spring-pressed member pivoted to a slide reciprocated in a guideway out in the underface of the throat-plate, the said member being formed with a tail or laterally extending camsface which, during the movement of the slide, strikes an adjustable wear-plate which causes the member to swing on its pivot and in such movement to engage and deflect the loop. The loop pusher is preferably formed as a pronged reciprocatory member mounted in the slideway of a bracket carried by the throat-plate and given endwise reciprocation by an elbow-lever pivoted to the bracket and provided with a cam-slot engaged by a projecting stud carried by the slide which supports the .loop spreader. The slide is ac- Specification of Letters Patent.

Patented Jan. 7, 1919.

Serial No. 47,215.

tuated through a rocker operatively connected with the main-shaft of the sewing machine.

In the drawings, Figure l is a front elevation of a sewing machine embodying our improvements, and Fig. 2 is a similar view showing the operative parts in different position. Figs. 3 and 4: are perspective views from the under face of a throat-plate supporting elements of the improvements;

the parts being in the positions shown in Figs. 1 and 2, respectively. Fig. 5 is a plan view from the under face of the throatplate, showing the slide and loop-deflector carried thereby; and Fig. 6 is a detail perspective view of certain of the parts separated from one another.

The improvements are shown applied to a sewing machine comprising the base A, and head 13 of the usual overhanging arm. Rising from the base A are the bearing supports I), I) and b", the former affording horizontwlly-disposed seats 1 upon which rests the throat-plate 2 formed with the needle aperture 2*. The head B supports the usual reciprocatory needle-bar 3 provided with the needle 4, and the presser-bar 5 to which is clamped by means of screw 6 a presserfoot 7 which, in this instance, is shaped for use in darning, patching and the like, the

fabric being fed in any desired direction by hand.

the rear of the machine and receiving its motion from the main-shaft through the usual intermediaries. The support 22 is in 'the present instance, pivoted to the base A at 22 and is rocked to impart the usual sidewise or needle avoiding components of motion to the looper-blade 22 .by means of the arm 22 forked to embrace-the block 22 which surrounds the actuating eccentric 22 on the main-shaft 14. In the present embodiment of the invention, the above Y 'shownin Fig. ,'after which the carrier 9 is returnedvto its 1n1t1al position as shown in described connections drive the looper-blade in the usual elliptical path embracing the needle-path; the looper 22 advancing at one side of the rising needle to seize the needleloop as shown in Fig. 3 and retracting at the face with a channel or guideway 8, to receive a sliding carrier 9 provided with a depending arm 10 apertured to receive a stud-screw 11 which is carried at one end of a link 12 connecting th ecarrier with a rocker 13 actu- 15 ated through suitable intermediaries by the main-shaft 1 1 of the machine. Pivotally mounted upon the carrier 9, by means of the stud-screw 15, is the pronged loop-deflector .16 provided with a cam projection or tail 16 which carries the depending pin 17 enj gaged by one end of a spring 18 having its opposite end clamped upon the carrier 9 by means of the set-screw 19. By the action of spring 18 the tail 16 of the deflector 16 is swung into position to be engaged in the tact block 20 secured upon the throat-plate adjacent the guideway 8 by means of the 1' screws 21. It will be seen that the actuation of rocker 13 will, through link 12, impart reoiprocatory movements to the carrier 9 and thus cause the loop-deflector to swing on its pivot and thereby engage and deflect 1 the needle-loop. The parts are so timed that 35 the loop-deflector is actuated immediately prior to the beginning of the loop-shedding movement of the looper. 22, and the loop is held during the retraction of the looper in position for penetration by the needle until the latter descends below the throat-plateand between the two limbs of the loop as Fig. 5.

The carrier 9 is held in position within guideway 8 by means of the base-flange 23 i of a bracket 24: formed with apertures 25 to receive two screws 26 by means of which it The - having an offset portion merging into the ders 27 adjacent an open slot 8.

channeled-block 0) provided with the shoul- Resting upon the shoulders 27 of the channeled-block T is the reciprocatory carrier 28 of a loop pusher 29, the carrier 28. being provided with a, projecting rectangular lug 30 which- L engages the walls of the open slot formed the downward movement of the pusher be n the block a and serving to guide the pusher and to limit its upward movement,

ing limited by contact between its horizon tally-extending pronged face," and the upper face of the ,block a an elbow-lever 31 tulcrumed at 32 upon the depending arm a of bracket 24: and formed at one end with a cam-slot 3e entered by stud 35 carried at the lower end of the fixed arm 10 depending from the. sliding-carrier 9. The opposite end 31 of the elbow-lever is forked to embrace a stud-screw 36 which passes through, a rectangular plate 37 and thence into the pusher-carrying member 28, the plate 37 cooperating with the Walls 27 of the channeled-block a to confine the pusher within the latter,

In the operation of the device, the forward movement of carrier 9 causes the loop-deflector 16 to engage and deflect the needle-loop immediately prior to the beginning of the loop-shedding movement of the looper 22,

"and thereafter the carrierremains motion fright from the position shown in Fig. 4:, its pro ect1ng stud 35 engages the walls of the cam-slots 34 formed in elbow-lever 31 and forward movement of the carrier 9 by a conrocks the lever on its fulcrum to move the pusher 29 upwardly, so that the loop released a y the looper and around, the blade of the needle is thrust above the path of the looper engaging fingers, one movable to seize and deflect a loop about the looper for penetration by the needle, and the second movable to push the said loop up the blade'of the needle and to hold the same abovethe path of the looper during its operative movement, and means for moving the said fingers in succession. V

' 2. In stitch-forming mechanism for -sewingmachines, the combination with a \VOI'IK'.

plate, a reeiprocatory needle and a looper,

of two loop-engaging fingers mountedbelow the work-plate for movement each in a plane 7 transverse to the other, and means for operatively moving the said fingers to successively deflect the same needle-loop.

3. In stitch-forming'mechanism for sewing machines, the combination with a recip rocatory needle and a looper, of a sliding carrier, a spring-pressed loop-engaging finger plvotally mounted upon the said carrier, a contact member in the path of movement of the said. fingerand adapted to swing the latter upon its pivot, and means for reciproeating the sliding carrier to periodically bring the finger into engagement; with a needle-loop. Y 1 i I 4. In stitch-forming, mechanism for sewing machines, the combination with'a fixed support, a reciprocatory needle and a looper, of an elbow-lever pivoted to said support, a loop-pushing member operatively connected to one end of said elbow-lever, and a reciprocatory actuating member having an operative connection with the elbow-lever whereby the latter may be rocked to carry the pusher into engagement with a loop of thread embracing the needle.

5. In stitch-forming mechanism for sewing machines, the combination with a reciprocatory needle and a looper, of a slidingcarrier and a 1oopdeflecting finger pivotally mounted thereon, a contact member disposed in the path of movement of the loop-deflecting finger and adapted to swing the latter on its pivot, an elbow-lever and a loop-pushing member operatively connected therewith, means for reciprocating the sliding-carrier, and an operative connection between the said carrier and the elbow-lever.

6. In stitch-forming mechanism for sew ing machines, the combination with a reciprocatory needle and a looper, of a throatplate apertured to receive the said needle and formed with a channel-way in its lower face, an actuating member fitted o slide within said channel-way, a loop-engaging member movable relatively to said actuating member and" transversely of said channel-way, and means for reciprocating said actuating member.

7 In a single-chain-stitch sewing machine in combination, a needle, a non-thread-carrying looper, a thread-engaging device and means for moving said thread-engaging device to engage the previously formed needleloop penetrated by the needle and move it along the needle and toward the work.

8. In a single-cl1ain-stitch sewing machine, in combination, a needle, means for reciprocating the needle in a fixed path, a looper, actuating means for said looper timed to cause said looper to shed the needle loop after said loop has been entered by said needle, a thread-engaging device, and means for reciprocating said device in a path closely adjacent the needle-path to engage the previously formed needle-loop embracing the needle and positively move the same out of the path of the advancing looper.

9. In a single-chainstitch sewing machine of the type permitting the work to be fed in any direction, a reciprocating needle, an advancing and retracting looper having the form of a single-pointed thread-engaging blade, actuating means for said needle and looper timed to cause the looper to back out of the needle loop after said loop has been entered by said needle, and means cooperating with said looper blade to position the needle loop engaged by the looper for certain entry by the descending needle regardlfesas of the direction in which the Work is 10. In a single-chain-stitch sewing machine of the type permitting the work to be fed in any direction, a reciprocatin needle, a looper, actuating means for said needle and looper timed to initiate the loop-shedding movement of the looper before the point of the needle has entered the previous needleloop about the looper, and a thread-deflector mounted for movement laterally of the needle-path to deflect the needle-loop trans- "ersely of the direction of retraction of the looper and to a position bearing a predetermined relation to the needle and looperpaths, whereby the descending needle will pass into the needle-loop with certainty during the retraction of the looper regardless of the position of the last stitch.

11. In a single-chain-stitch sewing machine of the type permitting the work to be fed in any direction, a reciprocating needle, a looper comprising a single-pointed threadengaging blade, means for advancing and retracting said blade to cause its point to pass the needle alternately at opposite sides thereof, and a loop-deflector cooperating with said looper-blade to deflect both limbs of the engaged needle-100p to the side of the needle path opposite that passed by the retracting looper-point, whereby the descending needle will pass into the previous needle-loop with certainty regardless of the direction in which the work is fed.

12. In a single-chain-stitch sewing machine of the type permitting the work to be fed in any direction, a reciprocating needle, :1 looper-blade, means for imparting advancing, retracting and sidewise movements to said looper-blade to move the latter in the usual elliptical path embracing the needlepath, and a thread-deflector cooperating with said looper during the retracting stroke of the latter to position the needle-loop engaged by the looper for certain entry by the descending needle regardless of the direction in which the work is fed.

13. In a single-chain-stitch sewing machine of the type permitting the work to be fed in any direction, a reciprocating needle, a looper-blade having endwise advancing and retracting loop-seizing and -sheddin movements and a loop deflector for movlng the needle-loop laterally of the path of the retracting looper, thereby to cooperate with said looper during its retracting stroke to position the needle-loop for entry by the needle regardless of the direction of work feed.

In testimony whereof, we have signed our names to this specification.

WILLIAM L. BARRON. FRITZ E. OSOL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

